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    <p>One could use the <a href="http://java.sun.com/javase/6/docs/api/java/nio/Buffer.html" rel="noreferrer"><code>Buffer</code></a>s that are provided as part of the <a href="http://java.sun.com/javase/6/docs/api/java/nio/package-summary.html" rel="noreferrer"><code>java.nio</code></a> package to perform the conversion.</p> <p>Here, the source <code>byte[]</code> array has a of length 8, which is the size that corresponds with a <code>long</code> value.</p> <p>First, the <code>byte[]</code> array is wrapped in a <a href="http://java.sun.com/javase/6/docs/api/java/nio/ByteBuffer.html" rel="noreferrer"><code>ByteBuffer</code></a>, and then the <a href="http://java.sun.com/javase/6/docs/api/java/nio/ByteBuffer.html#getLong()" rel="noreferrer"><code>ByteBuffer.getLong</code></a> method is called to obtain the <code>long</code> value:</p> <pre><code>ByteBuffer bb = ByteBuffer.wrap(new byte[] {0, 0, 0, 0, 0, 0, 0, 4}); long l = bb.getLong(); System.out.println(l); </code></pre> <p>Result</p> <pre><code>4 </code></pre> <p>I'd like to thank dfa for pointing out the <code>ByteBuffer.getLong</code> method in the comments.</p> <hr> <p>Although it may not be applicable in this situation, the beauty of the <code>Buffer</code>s come with looking at an array with multiple values.</p> <p>For example, if we had a 8 byte array, and we wanted to view it as two <code>int</code> values, we could wrap the <code>byte[]</code> array in an <code>ByteBuffer</code>, which is viewed as a <a href="http://java.sun.com/javase/6/docs/api/java/nio/IntBuffer.html" rel="noreferrer"><code>IntBuffer</code></a> and obtain the values by <a href="http://java.sun.com/javase/6/docs/api/java/nio/IntBuffer.html#get(int)" rel="noreferrer"><code>IntBuffer.get</code></a>:</p> <pre><code>ByteBuffer bb = ByteBuffer.wrap(new byte[] {0, 0, 0, 1, 0, 0, 0, 4}); IntBuffer ib = bb.asIntBuffer(); int i0 = ib.get(0); int i1 = ib.get(1); System.out.println(i0); System.out.println(i1); </code></pre> <p>Result:</p> <pre><code>1 4 </code></pre>
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    1. POHow to convert a byte array to its numeric value (Java)?
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    1. CO+1 for array with multiple values
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    2. COwhat about ByteBuffer.wrap(new byte[] {0, 0, 0, 1, 0, 0, 0, 4}).getLong()? this method should read next 8 byte and convert them to a long
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    3. CO@dfa: Thanks for pointing that out, it sure seems to work -- I'll edit the answer. :)
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